If you want to reduce the model size, use the original eyes, background and no teeth when you edit the model. On the web page, choose a lower quality setting to reduce the size.
For reducing the size of the script data, you can choose a lower quality seeting.
For lower data size when exporting to media, export to RM or WAV with a higher quality setting or use AVI codecs that are easily available on the Internet. (E.g. Panasonic DV Codec) After downloading it, right-click the INF files to install it. When you export to AVI, choose the codec that you just downloaded from the Target resolution.